“镇静的”的英语可以翻译为：composed，calm，[医] calmative，sedans，abirritative ...

整个事件中,他始终保持着镇静的头脑.He kept a level head through the whole incident.他显得格外疲劳, 但他的心情是镇静的.He looked exceedingly tired, but his mood was philosophical.那位编辑恢复了镇静的态度.The editor resumed his composure....